leake



R. C. LEAKE.

RAILWAY SIGNAUNG SYSTEM.

APPucArloN FILED JUNE 5. |916.

1 ,330, 125. Patented Feb. 1u, 1920.

INSUL A 'TJN 15a all D da sa r z Br ,(7 g, Qty f /n Z A HUM/Elf UNTTED STATES PATENT oEEioE.

`EIC!l'rIAIlLD C. LEAKE, OF ROCHESTER, NEW YORK, ASSIGNOR TO GENERAL RAILWAY SIGNAL COMPANY.

F GATES, NEW YORK. A CORPORATION 0F NEW YORK.

RAILWAY SIGNALING SYSTEM.

Application file June 5, 1916.

To all ic/wm it 'may conce/'1r Be it known that l, Kleiman C. limiti-L, a citizen of ther United States, and a resident of the cit).7 oi Rochester. in the county of Monroe and State of New York, have invented a` new and uaei'nl improvement` in Railway Signaling Systems, ot' which the following is a speciiication.

Thin invention relateis for use. in controlling electric circuits am more )articularljv lor use with electric circuits; Vtor railway signaling.

One. ol. theA principal ohjecta of this` inven tion ie to ao devise and coneirnct a meana that electric circuit which are controlled from a distant point maiY lic intermittently opened and cloacd for any length ol time.

Another olricct of thi` in vcntion is to provide a signaling: system comprising a means. selectively controlled from a distant pointv and used in conjunction with the ordinary lilock signaling where light signals are used, for giving: an 'additional indication which is distinctive in character.

Another object oi' this` invention is to providc a signaling' avatein coinpri-ing a means, selectively contro lcd `from a diatant point and used in conjunction with the ordinary block signaling' where light. signals are used, for canning the lights ot' `aaid light signals to he intermittently tlaahed for any length. of time.

notlier oliject of the invention is to so devise and construct a system t'or railway signalingr to obtain the, above mentioned ol)- jccta, that it may he practically and inex penaivelwput together to "irovidc a means controlled from a distant point for calming a light. signal to give an additional indication. distinctive in character, Without chang.

ing the construction or automatic operation of ysaid light Signal.

Other objects and advantages will appear as the. denari tion progresses and the novel features of t 1e invention will be particularly pointed ont in the appended claims.

The. embodiment of the. invention sheavn consists generally of a rignalinUr system for railways wherein arer used light signals of the ordinary type well -known to those skilled in the art of railway signaling. said light` signals having' dillerent indications which are automatically controlled from insulated wectional of a railway track and an additional ind' 'ation which ia Selective-.lyr

Specification of Letters Patent.

to dcviceav adapted` shown and dcscrihed in iniv cawinea rob.' 1.o, 1920.

Serial No. 101,749.

controlled from a central station and docs not alter or interfere with the aig'nal or the independently controlled indications` of the light. signal, and in addition to the above, named conditioingl a check may he obtained to Satisfy the dcspatcher or peraon at the central station oi' the operating. or other condition ot' the `mid signal.

Another advantage` ot' the cinliodicd vstcni is to inakil it poaaihlc l'or the` deapatcher at a, central .dation lo liccrV in touch with the operator, ot lrain along his4 particular div-rien. For example 1tV ina)` he thc dcripatchcn n iali to have .-.ai-l operator either stop and call the IlmVv patcliehr7 ollicc liv a telephone con\cniciitl placed along the tracliwav or he may wieli him to talie the neat aidingA and allow air other train to paas or to perform an;r other duties which may he `wt forth in the rides of the i'oad tor anch conditions. Thiry ia made poaailile. in a .System where light sie; nais are used, h v the dcapatclier lit-ing' alile to control aignal which are usually located near sidinc's for causingA auch iguala to give. an indication that will lic distinctive in charl acter troni the -indication which haa heen given autom-.1ticall)v hvv the ISignal. `auch a distinctive indication lacing given in. cane ing the nignal hoop lighted to lic tlaahcd continuonlv.

In deacriliing lhc invention in detail rclercnce is had to the accompairving drawing' wherein is pictured in a Single view a lia grammatic, illustration ot' the circuita1 and apparatus aelected for the pin-pose of exhibiting a. particular physical enihodiincnt of the idea of means nnderliinglr in v inven tion.

The system of signaling 'herein einhodiod involves the usc of an answer-hack mism. This answer-hack mechanism may be of any type suitable to perl'orni the functions peculiar to the sistem herein shown and ia preferably of the type fully prior applic-.c tion tiled March 2. i915. Serial Xinnher 16.863. It iS therefore considered that a` .simplified diagram ol' the an werhacli mechanism as nhownin the accompanying drawing dcrataiidiner of the present invention. This anan'er-hacli mechaniain i represented generally hy letter in the accompanying drawing and consi t ol" an an wer wheel l mechav will he lullicient for a clear unrevolubly mounted on rollers 2 adapted to bear on the inner periphery of said answerwheel 1, said rollers 2 being revolubly carried on pins 3 fixed in :i front frame plate (not shown). The outer periphery of seid answer-wheel 1 has equally spaced teeth 4 of di'erent lengths formed therein, the longer teeth being arranged in equally spaced code groups. Bearing on the inner periphery of seid answer-wheel 1 and spring pressed `outwardly from the center of seid answer-wheel 1, are contact Harms 5 and 6 which are pivotally fastened-te binding posts 7 und 8 respectively. Currled 'on the lower end of each Contact carrying erm 5 and 6, are rollers 9 of insulating materiel adapted to ride on'the said inner periphery of said answer-wheel 1 and to eoact with u notch "10 formed in Suid inner periphery. 0n either side of said answer-wheel 1 is shown an electro-msignet` comprising coils 11 and 12 respectively together with their pole pieces 13 und 14 respectively. Coueting with seid electrwmagnets 1s un oscillatable armature 15 liu-ving hxed thereto und oecillatable therewith :rn inistundinff erm 1G, at the upper end of which is fixed u bearing pin 17. Loosely 'carried on seid bearing pin 17 ere laterally .xtending pawls 18 and 19 haring at their outer ends projections adapted to engage the teeth 4 on the answer-wheel 1. Fixed in said front frame plete (not shown) and insulated therefrom is a cont-(ictpost 20 with which contact Springs 21 und 22, on contact cerY rying arms 5 and t' respectively, nre udupted to court es will be hereinafter more fully' explained. Oseillatzibly supported on u shaft (not shown) u control erineture 2l-l associated with Seid pole pieces 13 und 1.4 and having u dou'mmrdly Iu'ojectinpr arm 23. At the lower end of Huid arm 231, on member 23 ure lined laterally projecting blocks 23?, 233 und *2i'i4oiinsulating materiel which are adapted to strike the downwardly extending contact springs 24, 25 and 26 as the member 23 is rocked in onidireetion or the other. An erm 27` pivotully sup `ported at one end on e binding post 28,

fixed to seid front frame plete (not shown) and insulated therefronn is biased to the position shown and. carries et its other end e T shaped member 29. This member 29 carries ab its lower end u roller 30 adapted to coekct with the longer teeth 4 on said answer-Wheel 1. At the upper end of seid T shaped member 29 is au shaped conductive head plate 291 carrying two cont-arts 31 and 32 which respectively oppose but/ are normally seperated from contacte B3 und 34 which are held in cont-eet Springs ,35v Vend 36 respectively. The said Contact` springs 3.3 und 36 are held .in the respectire binding posts 37. and 38 which ure fixed 1n the said front frame plate (not shown) and insulated therefrom. The L shaped head plate 291 also carries a non'conductive presserpart, preferably a roller 39 which opposes the inner end of a, contact spring 40 held in e bindin post 41 fixed to and insulated Jf'ronurtront tgrame plete (not shown). This contact spring 40 carries n contact 42 opposing but normally separated from u, contact 43 on Contact spring 4l held in e binding` post 45 fixed to and insulated from the front frame plete (not shown).l The raising of the member 29 by enacting with the longer teeth 4 on the unswcr-wheel 1 will bring ull three pairl of (-onlucts, above mentioned, together, for closing certain unswer--bnck circuits, hereinafter mentioned. For a further und more detailed descrip tion oi' the operation und construction oi' the :insWcrJmck mechanism reir-menue muy be hud to the ubove mentioned application of ltirhurd C. lienke Scriul Number 16.863.

This .system also involves the use of u selector of any well hnonn type rupuble of respmfulingf lo impulses` imported thereto 'from u pair ot line Wires connected with u rienldingg,- station or device located :it u`diS- lent point, for causing u plurality of different circuits to be selectively closed. The selector'preferably need nud shown at B is ot the type shown und described in the lntent #1,1181'2() grunted to Mun-rice F. Geer und Rielmrd C. Leuke, March 24, 1914.

und consists of u pair of magnet coils 47 and 4P, together with their respective (ores 49 und 50 suitably supported in u pole piece not shown) which is fixed to :L front plate 51. Associated with said magnet coils 47 und 4H und their respective cores 49 und 50 is :1n oseillatable armature 52 suitubly held :inuinet und capable of being oscillfdr-d about its imite edge hearing 53. Attuched to the seid urnmtnre 52 and adapted to oscillute therewith is un upstzinding erin 54 carrying at its up )er end n, fixed bearing pin 55 on which ereloosely supported laterally extending puwls 56 and 5-7 which are adapted to engage with the teeth on sectors 58 und 59 which :1re loosely Supported on u sli-rift G0 fixed in the front plete 51 and to rotate said sectors independently and separately about said shaft, the sectors being held in their moved position by dogs 61 and 62 respectively. Associated with said selector are three `groups of normally open contact fingers fixed to u block 63 of insulating materiel und for convenience ure herein designated by thetmms HI, ST` und CL respectively und willbe hereinafter so culled. Euch of seidgroups of contuct fingers Hl, ST and CL comprising; opposed sets of normall.r open Contact fingers :ulupted to be closed when the arms ,64 und 65 fixed to sectors 58 and 59 respectively :ire properly ec tuated :is fully expluiner'l in the Patent #1;1'1113120 bereinbefore referred to.

The answer-back mechanism and the selector B hereinabove deucrihed are each, connected across the line wires .l and are protected against high voltages due to light-I ning hy a lightning' arrester li of any well known type which is connected across the line wires .l a'nd is also connected to ground 19T by wire 12H3.

The Signalin;r .system as herein set l'orth includes a central station or despatchees ottico located at a point distant trom the devices to he controlled and wherein are'located apparatus for sending impulsen over the `said line wires for operating the selector at a distant point which in turn controls other dericca similarly located from the central station, and for receiving indications sent hack over thc line tothe central .stations by the dcvicca opcratcd. This apparatus is rel'nesentcd generally in the accompanyingy drawings hy the letter (l. The device for sending' the impulses orcr tlTe line wires may her any of the well known types ot' Selective callingkeva and prelicrablione of thc tvpe shown and described in the Patent No. 1.l(l5,766 granted to Maurice l". (leer and Richard C. Leake August l, 19H. but for the Sake of simplicity is shown in the. accompanying drawing as a` simple telegraphefs key GG ot' the make, and break type ctinnecied across theI said telephone line wires J. .lissociatcd with Said key (in and interposed in\V the circuit` ot said ke \l no is a pole changing' device of the ordinaryv tvpe comprising' two pivotcrl 'armatures (3T and (5S and three coritact. buttons 69. T0 and T1. 'lhe contact hutt1 )ns (39 and T1 being connected to one .side of batter)` 72. also interposed in the -oircuit` for key ('it', ard contact TO being' connected to the other side of the batter)Y T2 so that when the pole changer is in one position. impulses of one polarityv may 'be sent over the line wires J and when the Switch is moved to itsl other position; impulser4 ot' an opposite polarity ma \v he sent over the line wires J. lmpedance coils TJ and T-l are also interposed in thc circuit for the. ke v ('lr to subdue or minimize the. noises caused hy the making' and brcakinw ol' the circuit at the key nl thereby avoidingQ disagrwahle sounds in the telephone receiver T3 which is also included in the equipment shown at the central lstation and is also connected in liridgc across the telephone line wires J,

lonventionally shown on the accompan vine' drawing and designated h v the letter l) is a polarized relay herein termed a stop re la)y of the well known type comprising a pair ot' magnet coil,K 7o and TT together with their cores 7S and T9 respectively. An armature 8() pirotally supported at its middle in arranged to he attracted b v either of the.

cores TH or Tl); and when so attracted is held l in this position. preferablyr by including a. permanent magnet in the magnetie circuits.

This armature.l is dirided by insulation `80l and carries on opposite sides opstandingcontact. arms 81 and 82 insulated from cach other and adapted to make contact. with contact points 83 and 8l respectively when said armature in attracted by either one o1 the other of said cores 7H or T9. The coils T6 and TT on the polarized relay l) aro selec tively controlled hy the .selector B and in turn automaticalltv control the direction of rotation ot' the answer-wheel l as will be hereinafter `more t'nllv explained.

The insulated section of trackway shown on the drawin;- and represented by the letter E comprises thc rails Si and 8l. and their imanlationzsI HT. Connected across one end 0l" the rails H5 and no by the wires HH and 8S) is the secondarv Jn ot' the transformer K and connected acrossv the other end ot Said l'ails N5 and Sli by wires ill and ll. is the coil oill the track rela) l*1 an armature 93 nl' which being' adapted to at times coacl with contacts .tland 2li, This` track rela)v l" is conrcntiomlll)i shonn on the drawing?r and may he an)` ot' thc wcli known types. For convenience it has` been herein illustrated as an alternating current` device.

The signal illustrated conventionally on the drawing and designated h v the letter (i vis .shown as a light signal of the well known type. This .signal is controlled through the track relai' l" and obtains its electrical cnergry from a transformer li also connected across the transmission line l. l'lowcrer. it is not contcmplattal to limit this invention to a particular type of `signal for it inavr obviously be used ith vaiious other types olI signals or devices not signals` and its energy may be derived from various sources.

.\lso courentionall \Y illustrated in the drawing;r and represented b v' the letter ll is a .stick relay of the kind before mentiom'al together with its armatures SW, JT and D8 and their cooperatinrr contacts 99. 10o. lol and 102.

The apparatus shown grouped together on tht` drawing and represented by the lette-rn .\--l-l)l"-(l and Il constitutes the equipment ol only one \\'a v station or signal along a division ot' a railway and there may lic anlv number ot' ,groups similarly arranged at anyY number ol other way stations or signals. cach being' selectively controlled from the Haine central station herein represented by the letter The selector B for each of said wa)l stations has its arms (S4 and (i5 relativelyv adjusted to respond to different sets ot impulse combinations to cause them to be. brought in proper alineinent to close any pair ol contacts ot' said contact groups herein represented by lll. ST and CL, said groups beineF the same on all selectors.

The operation ot' the selector B ia fully descrilaal in the latent No. 1.118.120 aborti mentioned and it is helievjed that the followr ing hriel' description of Suid operation will he oullieieut ut this time,

Referringi to the urroinpuuyilnr draining. :iu illustrated exiuuple unly he hud. Should tlul d pzlteher n'ih to opernte the lll eontitels. on th" fi'eleelor lh the rolnliiunlion for this4 pulr ol' t'onlzx'rlnl living l'wi. he would euuse urumtule of the hey no to he )'n'essetl ugi'uiust the eouturt point lll :unl the fol-4 lo\\iu, r rircuit \\'ill he eituhlished: from one side ol' the butti-ri` T2, n'irer: i115 und lill, eontuet I utton Tl und nriu lil' ol the pole ehnng'er in it lel'thzuul poftion, wire 11o. ilnpednnee T4. wires lli und llo, wire 132 olA the telephone line wires J, wires 131, lill). lzlhllu riirhlhuud roll -lwolA the .wllrrtor ll. nire luy li-llluiinl will li ol' *ihr .wrlet'lm l'i Wire lili` llli unil ifu 'Hire lll-lot' the telephotoh liiu when` l. nire@4 lll?y unil 12th iiupmlunie il wirr l'" teli-grupito 1 he); titi.. routm'l point ll l` vitre tlf, mm uw nl' tlu` )wir i-liniitfti is lli lillli-flml :ifllllini` eonlufrt hutton '5H :in-l wire hurt to the other side ol' tlnliuttery il?. yl'lir circuit uliore truffe-il will enlise i urwu of u irlniu polurity to energize the toile` lh ind -f of the selector l und the Sector 59 ol the se.- leetor ll to be picked up one tooth und the nrm (l5 to he eurrit-nd with it. To ohtnin the eoinhinuion li-rural, nulnely l-i the despntehor would rnuse the hey fill to 'oe pressed three, eurem-uve times; therein; setting up the above, trured circuit for euch Operation of the hei' und ruusiurfj three iinpuler1 ol the suine polarity to he nent over the line, Wires l alici the f-seleirftor uhu (i3 to lio :novell three siepi@ in ihr eonnlerrli'ehn ige diiertion bringY` in; the mill :wleitor :trui (35 in ulineinentwith the lll eontnot lingers. Next. the dee-- patcher will more the pole rhanniei from its left hund position ne shown in il.t draw ing to n right hund position so that the .firms (i7 und 68 will nime out of eontzu t with con tact buttons 7l und "i0 respettirely und into eontact ivith eontn'rt buttons "i" nud 69 respectively. From the foregoing description it Will be obvioilsly apparent that when the key (5(3 is caused to he pressed tive, times, with the pole changer in the condition described, that current flowing through the coils 0f the leeleetor ll in :an opposite direction will netuate the armature 52 in an opposite direcn tion until the seleetor urn) 64 in :illne- Inont with the selector urni (i5 und the Hl cont-nuts. When the :irme til und (lo are in the condition just described an additional impulse will he sent over the line wires J from Le, (itl with the pole rhungrer 1n the. first mentioned or letheuul position which will close theI lll conti-irte` in n nimmer tulhl explained in the nhore mentio- #1,1 '13,120 grunted to hluurlre l* *Grt* mi Richard C. Leuke. Hoving briefly d@ crilied the operation of the selector for one `oolnhinutiou itushould oe apparent tlmt, hy

sending' out liflerent numbers; of impulses from the hey 6G over the line wireev J, with the euri-ent flowing first in one direction und then in the opposite direction und an :ulditonul impulse euch time with the current llrlin'inp in the fil-e1 named direction, the selector in eupnhle ot lespondilig to u nuuilwr of dili'erenr, eoinhinutioiis and 0f se lerlirely rlosing u number of dill'elent ciruit control. lt ,uhould be understood that `when impulses ure. sont over the, line wires .l from the key no that ull Selci-tors along the line ure operated but that only the one inwinnits urne; ill und hij pr'operl'i" ud'jnsted lo vorrespond to the impulso combination heini; sent over the line. from hey 6lwill lie mpulile l rioting n cirifuit control.

To thune skilled, in the nrt of railway sig uuling; it ie generully known that, when the "nurnnil ele-ni K teni of Signalling i@ need, un unorf'ul'iied ni--uhiteii trneli section is normally t-uerui,;-. il und .-shere light eignzils nre allied, uV Jji'ei-u lump inflated. lonseiiuently in rel'erriugg-j to the uafmnipunying drawing u rireuit for the trurh relay if n'lay be trtu'ed un' 'ollon e: from one, side oi' the Secondary 90 oi' the transformer K wire 89, one ruil 86 of the truck section E, wire. 92, relay coil 103 of the truck relay F, wire 91, the, other ruil ST1 of the truck section E und wire 88 heck to the other V`ytide of the Serondnrr il() of the trmxsiortner li', Thur; it can he Seen that with no train `on the truck section E, the trnrlt relny l," will he energized eind eonseintently the armature Q5 of the truck relay l 1 will he picked up und :l rire-uit will be es tnhliehed follows und will hereinafter for convenient-,e he Called Circuit number one: from one. side of the secondary 104 of the trunufornier L wires MD5 und 10?, lump g ol' the light signal (i. wire 107, Contact point 94, ornent-ure 9% of the truck relay F. in its energized position, wire 108., bindingr posi 110. Contact spring 26, Contact point 109 of the, answer-barok mechanism A9 und wire 111 haelt to the other side of the ,secondary 101i o t' the transformer L. From the circuit just traced .it will he seen that with no train on the truck section E and thetrack relay picked up the lump g which in this oase is green will he lighted denoting to the operator of un approaching train that the. section is eleain y Should u train enter the track section -E it will Short circuit. the track relay F in u manner also well known to those skilled in the :irt'of railway signaling and the armature 93 of the relay F will drop, breuking contact with contat-'t point 94, and consequently opening rireu it number one which lighted the green lump and will multe contaet with con# tuet point 95 and will therehy establish n cirruit` herein culled circuit number two. which muy hetrueed as follows from one side ofthe secondary lll-.l of the transformer L, Awires 10S and 11'.'` lanip-r ot the light signal wire 1111 contact' point S15 and then as in eirvuit nnmlier one tor lighting the 2,rvon light` through armature $13 ot the travli relay F in its dviinergined position, wire 10H, hinding post 1111, vontat-t Spring it. vontavt Point 11".) ot the answvr-hael( lnvvhanisin A and wire 111 hack to the other side of the sevondariV 10i ot the transformer L4 lfroni the eirvuit just traeed it will he seen that, when a train enters the track fiction lil, the rvla \7 1 is dvenergizvd thereby vausinn the green light to he extinguished and the lamp r which in this ease in' red to he lighted denoting to the operator ol an approavhing train that the Svi-tion ie ovvupied Vroni the foregoing dvsvriltion ot virruit` *for thev liiiht Hijrnal it will he Sven that thv Said lig-h1 signal is rapahlv ot firing di tl'vrent di=tinviivv iuelieatimny smid iinlit'atiom heini; muti-oiled antoniatl 'ally lli' tin` traei; relay l" whit-li in turn ie antw inativzdly vontrollvd troni the travltY section ll. l'the ohjert oi 'thm` in.vnti.in i to make posxiiile the givinf ot an additional indieation hr the light signal (i without in an \v way l'hanging thv vonstrnvtion ot thv light siugnal (l o1' thel virenits for the previously etzitvd indieatioie` or their vontrols.

While the signal G :shown is ot' the type vapahle of firing onl\v two indieatioiw. oh rioniilr. other weil known types of signals, invluding' tlio 1e vapahle of giving three dit'- l'erent nipt-ets. Ina)Y he employed.

The train dvspateher at the ventral station living atall times familiar with the movements; ot' all trains on hin partivnlar division may wish to get into telephonie vomrnnnivation with. one ot' said traim` to gire orders to tht` operator ot A#aid train or hv may wish to have, a particular train hike a :sidingA to permit a following train to pass at a certain point or for any other reason he ma)Y wish to give to the operator of a train a signal that will be distinctive from all other signals said operator may encounter, Snell a condition an 'just outlined being possible in the invention herein embodied` for instaure a despateher may wish to get in toneh with a train approaching the signal which governs the track sei-tion l. therefore: he vannes the selector B to he operated hy sending over the line wires .l t'roin the key titi a vonihiuation of impulses. wliirh will valise the Hl voutaets on the selector l5 to he eloevd as ahorv dvsvrihed and hy so vloningr thv i*aid lll vontavts there in v-tahlishvl a eirffnitV numlivr three troni one side ot the lmttvry 15H. wires 133. 131i. 13T. 1255i. lifl. 14() and l-lfl. the lll vontavt fingerQ 14; and 14?. of tlu avlvetol i. in their elosed eondition, wires l-llnnd 1.3. voil 14H of thv tivlt rela)- ll. wires` 147. -l-H andu 1451 to thv other -ide ot the hattery IE7-t.

1 Front the last tr-.ivvd eirvnit it will he sven hy referring to the accompanying drawing that the coil 141' otl the, Qtiel( relay ll han4 heen. energized and its arn'iatures 5)(5, 97 and JH will he picked up and thle Will he established a circuit number tour from one side of battery 184, wires 135 and 150, the right-hand side ot divided armature Si) nl' the stop relay D in the position shown in the. drawing', its upstanding Contact arni H1, vontavt point 543, wires 151 and 152, armature 111i ot the, `stiel( rela)v H in its npper position, Contact point 511), wires 153 and 145, voil 146 ot' the stiel( relayr IL wires 14T, 148 and 14E) hack to the other side of hattvry 1254*. VFrom the .foregoing circuit it van he rwen that after the roil lfit' irs ener'- ginvd hy the dosing; ol' vii-vint nuniher three and the armature Ulf han hveu picked up that, thv voil 14o will he hvld in its energized condition hy 'the aid vire-uil niunher toni'. after ihevirvuit number three1 V'orenergizingstick rela)Y Il, whivh is only momentarily closed, ii; lirolivn. A\noi'hvr is nieto formed virvuit when eoil 1415 ol thv etirfl relay 1l is energized which ici4 a hranrh ot circuit ninnher 'han'` for holding: attivit relai" il energized,

and will hold roi] 11o ol' the stiel( rvla}Y H f in an energized condition after the breaking ot' the said circuit inunhvr tonr hy the shift-l ing' of thv Stop rela)y D troni the position. ywhown in full lines on the drawing to the position Shown in dotted lines, as; will be hereinafter rnore toll)r explained. This cirenit may he traced as follows and is herein called circuit nninber tive: from one side o the hattcri 134. wires 1?5, 13G, 137 and 154. vontari poet 20. vontaet finger 22, contact arm (i in the position shown in the. drawing and hiuding post, tw of the answer-haelt meehanisni A, wires 15? and 152 arniatnre Siti, o1 the stick rela;v l1, in the upper possi' tion.vontaet point 111. wirvcw- 15? and 115., eoil 11V oF stiel: rvlajv 'IIL wires` 14T,y 149 and 11S) bark to the other side of the hattery 134. Then the coil 146 ot' the. stiel( relay H is; energized h v the forming; of circuit. nuinher thrvv.thv armature 9T of The stick relay l'l in raised and nialiv eontavt with contact point 100 and a vireuit whieh muy heI trnt'edas follows is established and is herein valled circuit' nnmhvr six: troni one l ide ot' hatteny 134, wirt` 1255. 12%(1 and 15G. binding post 15 ,vontact spring! '14. rentar-t point 158. wire 159, lvt'inaud eoil 11 ot' the ans\\'erhael nivchanirfin wires 1li() and 1151. front eontact point 1U() and arlualnrv .17, o1 thv Stick rela)4 ll. in ital upper powition. wires 162, 14S and '14!) haehV to thv other iide ot hattery 11H. The ahovv traced eirvuit nnnihvr six l\'\' vnerllisningg, the voil 11 of thv answer-hack lnvehanisnl A. valise@l armature 13 to lie-attravtvd h v vorv 131 and thv arnl 1( fixed to thv arlnatlirv 15 to hv rovl vd to the right and pawl '19. earried hy the :irni 113. to engage the, teeth Al on thv anmvvr-whvel 1 and to rotate said answer-wheel 1, one step in a clockwise direction. Current flowing as traced in circuit, number six sets up a ma netic tlnx in the core 13 and the oscillatab e control armature 23 is attractedby the core, 12, as fully set forth in the abo`ve mentioned prior application Serial #16,863, and rolated about its axis in the direction indicated by the arrow 1. Aa the control armature Q3 is rotated about its axis, the downwardly extending arm 23 moves with it in the direction indicated by the arrow u and the block Q3* Strikes the contact spring forcing it out ofcontaet with the Contact point 15S and thereby nunnentarily breakin, r circuit number six for energizing coil 1l on the answer-hack niechaniam or in other wordel the armature 13 ln'calo;V 'te own op erating circuit, As ion as circuit number Six is broken and the arnniture-V l5 and 2 are released they return to their neutral positions. the firmatari la by it: own wright and the armature ls' as actually1 conatructrid and explained in my prior application lit-rein above referred lo la ingr provided with a centering :lr-rice. 4lliua the` circuit number ix is again completed by the tentar-t springr J4-again coming in contact with contact point 15??. to again energize the coil 1l and thus said coil 11 may be automatica]l)Y energized and dcinerggizetl under the influence of thc said circuit number six and the armaturen 15 and 23 to assure automatic continuous` Step by step rotationv of the answer-wheel l until it is: Stopped as hercina fter explained.

The answer-wheel l aa before dcucrbed has long and short teeth formed in ita outer periphery` the loue teeth being arranged in code group,y and bein; r adapted to engage thc roller lU on the arm ffl and by meaneof circuits formed by thc lifting of' arm 2l), to Send impulsen correspomling to the code groups over the telephone line wires J to the telephone receiver at the central station These code group may be arranged in any desired series and any desired number of groups but in this particular cane the :mamar-wheel 1 has three code groups which are arranged in series of 3-2 combinations, each Serien comprising three long teeth spaced the distance of one short. tooth from two other long teeth. Each series of fire teeth being arranged about the outer periphery ot' the` answer-wheel 1 in auch a manner that radial linea dra .vn through the center of each group will lle one hundred and twenty degrees apart. which also is the space between the arin carried rollers 9 adapted to coact, with the notch l0 in the inner periphery ot' the answer-wheel 1. AS expla ined more fully hereina fter, the answerwhecl 'l is automatically stopped in one position wlin the roller 9 on the arm 5 is in the notch 10as shown on the drawing, no "n ianoaaa the other poaition when the, roller 9 on the arm ia in said notch 10; and since the answer-wheel 1 in moving from either one of these positions should, in 'order that the cori-eet indication may he given, commence one of the code sequences or Ieeriee of five teeth, it is necessary to space the rollers 9 on the arma 5 and (i apart for an are of one hundred and twenty degrees, that is, the Same arc. as is included in the sector wherein are located each series of ve lon teeth.

At the, same time that block 23* strikes the. contact spring 24, the block Y232, which ia also located on 'the arm 23, strikes the contact spring 2G and in a like manner forces Acontact Spring 26 away from its Contact point 10.) and interrupts circuit number one, toiy lighting the green light in signal (il but as lierforc. described, the circuit number Six which controlal armature 2,3 and arm 23 being at the saaie time broken the, arm 231 will return to its middle position and circuit number one 'will be, again closed. As also described with referclice to circuit number bix, the, faiid circuit number nix will be intermittently iliade and. broken. and it will therefore be obviously apparent that the seine condition will be true in the case of circuit number one and also whenthe track Section E is occupied and Circuit number two is ellective a similar condition will exist. From the foregoing description it will readily be seen that if either the ,reen lamp 57 or the red lamp r 'in signal (1r is lighted that its circuit will be. intermittently runde, and ln'tdien and the iight will be internilttently tlaehed and will ao continuo until the anaweiback niechaniani A in atopped au hereinafter explained. i

lVhen the auawer-whecl l is rotated continuously in a clockwise direction as before described, the roller 30 coat-tis with the long teeth on the answer-wheel 1 and arm 29 is lifted to establishtwo separate electrical circuits and to give repeated distinctive 3---2 clicks audible in the telephone located at the central station or dcspatchers ollice C. The first of said circuits may be traced as follows and is herein termed circuit number seven: from one side of lmttery 134, Wires 135, 136, 137, 138 and 163, the primar)Y 461 ofy an induction chil 46, wires 164-. binding post 38, contact tin-ger Btl. its contact. 34. con"- tact 32 on member 29. member 2S?, its other contact 31, contact 33 on contact linger 35. contact finger 35. l'nudingpost 37 and wire 165 back to such portion ol the` bal-telf.' 134 a's shall assure passage of only so much oi" i a energy au may he necessary for completing the answer-luidt circuits and nraking the answer-back clicks Sutlicienthr audible at thettelephone which is included in a circuit number eight induced by making and breaking circuit number seven and may be traced as follows: from one side of the secondary wire 124 of the telephone line 462 of the induction coil 46, wire 164, bind-` ing` post 38, contact Finger 36, Contact 34, contact 32 on member Q9, member 29, arm Q7, binding post 526, wires 166, 126 and 125, line Wires J, wires 119 and 167, telephone receiver 75 at the central station (el, wires 168 and 118,1ine wire 132 of the telephone line Wires J, wiresl 131, 13() and 169, binding post 15, contact finger 44, its contact 43, contact 42 on contact 'linger 40, Contact finger 46. binding post 41 and wire 170, condenser 171 and wire 172 back. t0 the other side of leecondary 462 of the induction coil 46.

From the above traced circuits numbered Seven and eight it will be apparent that the clickal will continue to be -heard in 'the telephone receiver l5 as loop,r as the answerwheel 1 rotates in a clockwise direction and the des )atcher will be inlornled that the Stick relay l. has been picked up. and that the answer-wheel l in being operated in a cloclc wise direction and also after threi` auch code groups have been received and the answei1F back still continues to come in the deepatcher is assured that the opcratirm` are continuous, for reasons hereinafter more fully cX- plained, and that the Signal light ia being; flashed continuously, To stop the rotation oi' the answer-wheel 1 and the consequent audible indications, the despatcher by operating the key 66, causes the neceasary impulses `to bc sent over the line wiresl for operatinp,r the Selector 1% to close the ST contacts, thereby eutalbliahing a circuit herein called circu it number nine and may be traced as; follows:` from one side of battery 134, wires 135, v136, 137, 138, 136, 140 and 173 ST contact fingers 171 and 175, wire 176, coil 76 of the stop relay 1), Wires 177, 173. 179 and 149 vback to the other side of battery 131. From circuit number nine just traced it will be. seen that coil 76 becomes energized and the leftband Side of armature 80 of' the stop relay D is attracted by the core 7 8 and moves contact arin 82 on armature 80 into the position shown in dotted lines on the drawing and into Contact with contact point 84, at the same time bringing contact arm 81 out of contact with contact point R3 and interrupting circuit nnmfber four which is one of the tivo circuits which hold the stick relay H in its energized or stuck up condition. however the stick relay H will remain in its energized or stuck up condii tion due to circuit number five and the ancontinue to rotate in the until the notch 10 comes opposite the roller 9, on the arm 6, when said roller 9' will drop into Said notch 10. on the hery of the answer-wheel 1` insWer-wheel 1 will clockw ise d lrectiox 1 inner pei-ip terrupting circuit number fire. for sticking' up Stick relay H and causing' the amnaturcs 96 and 97 and 9S of the said slick relay H to drop, lhereby interrupting.r circuit number six f or energizing coil 11 and stop 'm the continuous rotation of the answer-w ee 1. When the coil 146 nt the stick relay dcnergized by the interrupting of it@ stick circuit herein numbered five and the armatures 97 and 98 drop there is. established a circuit for tbe answer-back coil 11 and a circuit for the answer-back coil 12 and are herein numbered ten and eleven respectivelyl Circuit number ten may be traced as follows.: commencing at one 'fdc of battery 131, wires 135, 136, 137 and 154, contact post 20, contact finger E21, Contact arm 3 with its roller l) out of notch 10, binding post 7, wire 180, Contact spring' 25, contact point 181, wires 182 and 183, coil 12 of the ai1s\\'e1-lnick mechanism A, Wire 181, back contact point 161 and armature 97 o1 the, Stick rela?.Y l1 in its dcinergized condition, wires 16:2. 148 and 119 baci( to the other side oi' batlcriv 121.1,

Circuit number eleven mayY be traced as follows: connnencing at one side of battery $4-, wires 135, 136 and 156, binding; post 157, contact spring' 2l, contact point 158. wire 159. coil 1l oi'V the answer-lundi mechanism A. ivirea 166 and 185.1acli contact point 11h and armature 9S ot the stick relayY ll in its dencrgrized condition, wire 156` contact point Srl, contact arm 82 and the lefthand end of armature 8() ot' the stop relay D in the, position shown in dotted lince` on the drawing, wires 187. 178. 179 and 110 bach to tbc other vaide of battery 134.

The dropping` of th(` armaturen` 97 and 9S close a break in cach of circuits numbers ten and eleven and at the instant that' the said armatures` 07 and 98 reach their lo'u'er position and make Contact with Contact points 101 and 102 respectively. the control armaturi- 'llis still oscillating and may at that instant be in position to close either or per` hops both ot those circuits at the Contact springe Q4 and 25. Assuming thatthe control armature Q3 has been moved in a direclion opposite to that indicated by the arrow r1 and that the Contact spring 25 is separated from its` Contact point 1552 at the time the armatures 97 and 9S, of thc stick relay ll. drop, then the. circuit first made will be through contact Springr :7B-l and contact point 15S which are closed at that time, as in circuit number eleven for coil number 11. The answer-wheel 1 will thus be rotated one Step in a clockwise direction: the control armature 23 will more in the direction indicated by arrow n, and arm lf-l* will cause contact springs 24 and 26 to be separated Jfrom their respectivo contact points 15S and 109. in a manner before described. to interrupt their respective circuits. As Soon as the circuit number eleven for the. eoil 11 has been interrupted. the circuit number ten for coil number 1Q cannel the armature 15 to be at tracted and the answcnn'heel to rotate one step in a counterclockwise direction as here- -ful y explained.

inbefore, described. Tt therefore can be seen that circuits numbers,` ten and elevcnwillaltornata-ly bo made and broken and the coils 11 and 12 on thel answer-back mechanism A4 will be alternately energized and denei-- ,f {ized canning the answer-wheel 1. to be stopped first one step in one direction and then one step in thc opposite direction. or in other words the roller Si on the arm f3 will rido out of and into the notch 10 on the anlswer-whcel 1. said answer-wheel 1 continuing to 'be so operated until stopped by the des )atelier which will be hereinafter more I 1f instead of circuit nuniv ber eleven for coil 11. circuit number ten for coil 12. had been 'made the result would havo been the saine after the first makingr and consequent breaking of the circuit ten had been accomplished and the awww-wheel,1 would have operated in thc manner just described. f it Should happen that the control arma` iure 23 is in the middle position at tle in stunt arniatureafi and HR drop. the Same op eration of the answer wheel 1 will occur. since one or the other of the voile 1l or l? wonfd preponderate in itsA attraction of ar mature 15.

By referring to the drawing it will be seen that as the coilS 11 and 1Q on the anawerback niechaniani A are alternativenr energized and deiinergized that the control armatore 225 will be alternatively attracted by wires 13 and 14 and that the arm Q31 on control armature 2? will alternately open and close thc circuit` through contact springs 14 and 2.1. 1t will also be seen that contact spring 26. which ia included in both circuits numbers one and two for the green and red lamp` reapectivcly of the aie nal G, will be broken each time thc arm 221 swings to the right or iu a. direction in dicatcd by the arrow u and that the lamp inthe eignet@ which ialightedlat that. time.

depending upon whether or not the track section E is occupied. will be continuously iiashed.- thereby giving a third ii'irliration which is distinctive in character. to the operator of a train.

' lWhen the operator of a train has,l reco@ nized the flashingP signal and ha reported y to thedespatchei' that hin` order has been carried out, the despatcher atthe central station C nia v stop the lashingand doesfso by operating-the selector and the key (lo as bei0r 4 described and causing the l(group of CL contacta `to be closed. thereb)v establidiing a circuit which is herein called circuit ni'nnbcr twelve and may be traced as follows: commencing: at one aident' battery 134. wire` 135. 13G. 13T. 139. 139 and 188. CIL contact fingers 189 and 190 of selector B wire 1111. right hand coil 77 of the stop relay D. wire` 192 179. and l-Ll back to the other Side of battery 134. From thccircnit just traced i* will be seen by roterrina to the drawing that coil 77 on the stop relay l) is energized and the armature S() and alao its contact arms 8l and 8:5 will he moved from the position last occu pied or the position shown in dotted lines on the drawing to the position aa shown in full linea on the drawinga, thereby interrupting circuit number eleven for coil 11` ot' the answeibach mcchaniani A. however circuit number tcn for coil 12 being made through contact finger 21 and contact post 2() of the anawcrdmck mechanism A will now rotate thc anawerovhcel 1. step by step in a colintcrcloclnvise direction until the notch 10. on the answcr-wlwel l, comes oppoaite the roller i) when laid roller will drop into said notch l() and interrupt thc circuit number ten for the ooil 12 thus atoppingr the rotation of the answcravhccl l, Aftera-ircuit number eleven for coil 11 is interrupted and the anawcr'n'heel l ia rotated in a countcrcloclcwian direction by the action o1' circuit` number teu for coil 12, two serien of ml rinawcr bach' clicks will he, acm over the liucy in a manner before described. to the telephone in the. central station C informing the despatcber that the devices have operated correctly and that the. fiashinp: of the lamp in the signal G has stopped. It. will be noted that in this case the answer-back indication while it is Coinpoaed of the same, seriesof clicks or impulses. they arcl lsent over the line in the reveraer order. namely, :-fl instead of 3 2 an was the ordcr of the tiret indication received by the dcspatcbcr and herein before described. This condition oi" the indication will inform the. dcspatchcr that thc. answcr-\\'lie,el is opcraling in a counterclocliwisc direction and that the stick rela)y l1 is in the. deenerg'izcd condition and also that the Stop relay 1) is in its rightliand position.

Should the same or a succeeding despat-cher wich at any time to verify the condition of the signal as to whether a lamp is flashing or is lighted steadily. he may causo the CL contacts to bc closed in a mannen; fully explained above thereby establish ingr a circuit number thirteen. which may be traced as follows; from one, side of the battery 134. wires-4 13:1, 136. 137. 138, 139 and 18H L,l contacts 189 and 193 of the selector vl wires 191 and 183. coil 12 on theI anmvcrdiack mechanism A. wire 184, back contact point 101 and armature U7 of the .stick relay H in the delincrgizcd condition. wire@A 1132. 14R and 149 back to the other aide of batterjiy 134. From the circuit just-traced it will be noted that the coil 12 is energized and that the ans\\ei-wlieel 1, in a manner full)v described. will be `not-ated one Step in a conntercloclnviae direction. The roller S) on the arm 5 will therefore be moved out of the notch 10 on the answer-wheel l and con tact finger 21 will make Contact wit-li Contact pgst 2() thereby restablishin circuit numr ten. This circuit will t en cause the answer-wheel 1 to make one complete revolution in au coimterclockwise direction and will automatically stop when the notch 1() of the answer-wheel 1 comes oiposite the roller 9 on the arm 5. During die rotation of the` answer wheel 1 as just described it will obviously be seen that three series of answer back indications will be sent over the line and will be audible in the .despatchefs telephone. This will assure him that the stick relaylis in its denergized condition and that thestoprelay D isl in its right-hand position, )the position shown in the drawing, and consequently that the signal lamp is not flashing.

0n the other hand i' a despatcher after having set a signal flashing and having stopped his answer-back indications as before described, Wishes to check himself or (StiV the signal he may again cause the HI contacts to be closed in a manner fully described. This will reestablish circuit number three for ener izing the stick relay H, thus interrupting oth circuits number ten and eleven for coils 12 and 11 respectively.

However when the armature. 97 on relay H is lifted, it again makes contact with contact point 100 and circuit number six for coil 11 is again established. As the system is herein shown, the despatcher should be careful in the above case to hold the key 66 closed a moment after sending the necessary impulse in order that the HI Contact ,fingers 142 and 143 will remain closed long enough for the circuit number six t"o step the answer-wheel 1, one step in a clockwise direction and thus assure the restablishing of circuit number five, which is closed when the roller 9 on the arm G is out of the notch 10 and the contact finger 22 bears against Contact post 20. Said circuit number five will then hold the stick relay H energized until the answer-wheel 1 makes a complete revolution in a, clockwise direction and the notch 10 again comes opposite the roller 9 on the arm 6 causing said roller lto drop into said notch and to break circuit number five for sticking up said relay H. It will bev noted that nce the answer-wheel 1 has made a com l te revolution, three sets ot' 3 2 answerack indications will have been sent over the line to the despatcher assuring him that the signal was fiashing at that time, for if the condition of the signal had been otherwise the answer-back indication received b '-him would have been continuous instead o only three sets. As soon as the stick relay H becomes denergized by the breakin of circuit number live, the armatures 9 and 98 of said relay H will drop and again make contactwith contact points 101 andA 102V thus restablishng circuits numbers ten andeleven for coils 12 and 11 respectively. From the foregoing description it will be seen that it is possible to make a check on the flashing of the lights in the signal (lr Without interrupting said flashing.

1n describing the construction and operation of this invention, reference has been made to the apparatus at only one station along the track; but it should be clearly understood that inv practice a number of similarly equipped stations along thc track would be used, the apparatus at all of these stations being connected to the same line cirL cuit. The apparatus embodying the invention would not ordinarily be applied to every block signal of the block signaling system, but only to those block signals which were located adjacent to sidings or at other points Where it is found desirable to give orders to the crews of passing trains. The apparatus embodying this invention used at each of the several stations would he constructed the same, with the exception that the Selectors at these stations would be adjusted so that their groups ot' contacts would be operated by different and distinctive series of impulses, and the answer-wheels at the several stations would be provided with different groupings of long and short teeth so -as to provide for the sending of different and distinctive code signals.

It should be understood that there aro other features of the answer-back mechanism that have not been brought out but as they are not involved in this invention and aretully shoxi'n and described at length in my prior application hereinbefore referred to, yit not considered necessary in this case to discuss them further.

Although l have particularlyY shown and described the construction oli one physical embodiment of my invention. and explained the operation and principle thereof; nevertheless. I desire to have it understood that the forni selected is merely illustrative, but does not exhaust the possible physical embodiments ot' the idea of means underlying my invention.

lVhat I claim as new and desire to secure by Letters Patent in the United States` is 1. In a signaling system, in combination: a Way-side signal provided with an electric lamp; a local signal circuit including said lamp; electrically operable means for periodically opening and closing said circuit to cause 'flashing of the lamp; means controlled from a central station for governing the operation of said means; and answerback means for giving at the central station a code signal'ihdicating that saidrelectrically operable means is operating.

Q. In a signaling system, in combination:

Said eirenil; to rire said way-side signal an arrestive aspeet; me ns controlled from -a central stat-ion for determining,l the operation. of said means; and ansner-liaek meeh anism for sendingr a eode signal to the rentral station indieating' lhat said lastanelr tioned means has been plared in rendition te eanse operation ot' said eleetrieally operable means.

3. In a si naling system, in eomhiuation: a Wa -side light signal, a local signal eir enit `iin' ,f igoverningr said signal; electrieally operable means for intermittently opening and closing said eirrnit; controlling t erires for said means; means eontrolled from a central station for plat-ing said rontrolling devices into condition to canse operation ot said means; and answer-hack means` for giving at the eentral station a rode signal indicating the operated eondition oi said eontrolling deviee.

4. ln a signaling; system, in eomhination: an impulse transmitting;r device loeated at a .eentlal station: means lor-ated at a point. remote from said central station seleetiwly eontrolled by said transmittingr derive; a relay momentarily con! rolled h v said first nientioned inea-11s; means for eontrolling said relay after said irst mentioned means has beeome inetl'eetive; means rontrolled hy said relay for giving at said renti-al station a persistent code indieation of the operated con-- dition of said relay; means selertiiely eontrolled by said lirst mentioned means for causing' said persistent indieation to step and for rendering said second mentioned means inefl'ertive; a rireuit; means eontrolled by said relay in its inetl'eetire condition Jr'or intermittently opening and closing said erenit for an' desired length of time and means also se eetively controlled hy said lirst inentioned means for rendering said last inentioned means ineffective.

`5, ln a signaling4 system, in eoinliination: a way-siflefsignal provided with lamps; a loeal sional elreuit inrluding;` said lamps: electrical-ily -operai-ile means for openingr and closing said eirenit intermittentlyg eontrol ling' devil-es for said means: means eontrolled'froni a ventral station for governing said eontrolliiw derives; answer-haelt meehanism for sending a signal to the Central station;V and means inrlnding;r said answerbaek meehanism for indu-ating the operated condition of said eontrolling.;n deriees at any time Without ehaiigfiingr sueh operated eenditions. l

6. Tn a signaling system; in eomliination: a r'lay'g meansv for energizing said relai7 from a distan` point: i-neans'lor holding said relay in ilsrneifgiaed rendition after said first mentioned means haslwrmne ineffeetive; answer-haelt means controlled hy sind relay in 'its energized rendition for giving at said distant point )ersisl'ent rode indications ol the energized condition ot' Said relay; means for rendering;V said second men finned meansv imtl'eetire and for causing said persistent indirations to stop; a signal; lamps for said signal; a eireuil for said lamps; means eontrolled h v said relay 'for intermiltenti)Y opening anilrlosing said eirruit to canse said lamps lo he intermittently flashed means eontrollml h v said Iii-st mentioned means for ransingsaid dashing to Stop; other answer-lmek means eontrolled by said relay in its (li-energized rendition for giving;r at said distant point repeated rode indientions, distinelive in eharaeter from the first mentioned indirations. that 'said flashing.Y has heen stopped: land means'eontrolkal from said distant point for verifying' said stopped eondition.

7. ln a signalingf system. in eomhinatiou: an insulated stretrh of railway trark; a ein euit for said stretch oi railway track; a relay included in said eireuit.: a signal for said streteh oi' traek rontrolled lw said relay; lamps for said signal: a eireuit for Said lamps: means eontrolled,from a distant point for intermittently opening and closing said eirenit for said lamps to eanse said lamps to he. flashed for any desired length of time; means at said distant point for rerit'ying said dashing;r condition of said lamps and ni'eans eontrolled from said distant point for rausinzLY said flashingr to stop.

S, In a signaling' system. in eomhinationf a plurality of' insulated traek'seetimis; a eireuit for eaeh ot' said track seetions; a signal for eaeh of said trark seetions. capable ol assuming' ditlerent operated conditions: a eireuit for eaeh of said signals, antomatieally controlled b v said first mentioned eil-enit; means for intermittently opening and elosing said last mentioned eireuit for any desired lenv l1 of time; and means eontrolled from said eentral station for governingr the operation of said mentioned means.

tlf In a signaling system, in eomllination:

a relay; means seleet1'\\'e.ly controlled from n eentral station for energizing said relay; means for holding said relayenergizddafter said first mentioned means has`- heef'ane inetlertire: answer-hack means eontrol'led by said relay for sending to said centi-ai station persistent redeV indieations of the energized rendition et saidrelay; other means selectively7 eontrollml-from the'eentral station for for any desired length of time;

wandering said holding means,|neflectire.; i

and means for stoppingr said answerd'iaek means at the end ol' a eode,

IU. ln a signaling system` in combination;V a relav: means seleetlrely eontrolled froinI a,

distant point l'or energizing sind relatif#f means lor holding said relay energized said I'irsl mentioned means has become in-` (-onti'oilvd from lsail contrai station for canaingl any onu oi more of said signals to give an additional indication to said passing train which is distinotivo from its othoi antoniativally vonti'olltai indications.

20. ln a signaling' systum, the combination with a pitn'aiit)y of automatic liloclc lsignals, nach uapahlo ot' giving ditiei'ol'it indivations to a [awning train` of a ventral station` nnanhl assiaiiatvd with nach of said Signals t'or antoniatiually govvrninglA its indications in accordance with tiatiiv` conditions. automataI apparatus associated with oai-li signal and solvctiwiy controllati from said ltnti'al station for canning: an \l ono or niortx of said signals to givv an additional indication to -said passing train which i5 distilntito fi-oin ital othui' automata-ali)Y conlloihil indii'ationmand answii' hack moans assoviatod with vai-h oln iQaiil Signals foi' sending' to said vonti'ai y#lation a codo indiiation of tho oporating (-ontiition ol' said appamtn l anni loiii` intlit-ation living` iiistini'tii'il foi' linA ilitii'iont liloi-h signals.

21. In a si rnaiin r system. the. combination with a piuia itir o automatic block signals, each capable o giving different indications,l to a passing train, of a contrai station, means assoviatud with each of said Signatl for anto niacicallv goi'vrninr its indiations in accoi'dain'v with tra 'o conditions, automatic appai'atns associated with each signal and stlvi'tiwly vontl'ollod from said contrai station for (-anirsinligl said signal to give an additional indication to said passing train whiih is distinctivo from its other automaticallil mnti'ollmi indii'ations; and incanst-onti'olled fi'oni said central lstation foi' enabling a distimtivo codo inditation bo be obtained at, thi` t'tntlal station from any onel of the, hlock signals tolling of thv opiiatinglr condition ot' thtI voii'osponding.r apparatus, this invans piiniitting snvh todo indication to ho ohtaini-d any nninhii 0i' di'vwnt times without vhanging thv oxistinihl` opi-ratingf vonditon of thi voitwiliondin; apparato".

RICH 1t l) C. LlCAK ii). 

